phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO docttorrdiscluc_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('467f91356add03ef1a60131c8ebd5a6b', -1, 1542439950, 1542439950, '3692c318', -2, 0, 0)

Line : 190
File : sessions.php